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Finding the Fourth Proportional to 15,168.87, 20,932.29 and 8,455.05

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Solution

The fourth proportional to 15,168.87, 20,932.29 and 8,455.05 is: 11,667.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,168.87 : 20,932.29 = 8,455.05 : x
  2. Step 2: Convert to fraction form
    15,168.87/20,932.29 = 8,455.05/x
  3. Step 3: Cross multiply
    15,168.87x = 20,932.29 × 8,455.05
  4. Step 4: Simplify right side
    15,168.87x = 176,983,558.56
  5. Step 5: Solve for x
    x = 176,983,558.56/15,168.87
  6. Step 6: Final answer
    x = 11,667.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.